Merge pull request #23827 from yuwata/sd-event-process-buffered-inotify-data

sd-event: process buffered inotify data

2 files changed, 56 insertions, 4 deletions

diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index e5d370d4f3..a37147d1d5 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -1799,7 +1799,7 @@ static void event_free_inode_data(
         if (!d)
                 return;
 
-        assert(!d->event_sources);
+        assert(LIST_IS_EMPTY(d->event_sources));
 
         if (d->fd >= 0) {
                 LIST_REMOVE(to_close, e->inode_data_to_close, d);
@@ -1862,7 +1862,7 @@ static void event_gc_inode_data(
         if (!d)
                 return;
 
-        if (d->event_sources)
+        if (!LIST_IS_EMPTY(d->event_sources))
                 return;
 
         inotify_data = d->inotify_data;
@@ -3874,7 +3874,7 @@ _public_ int sd_event_prepare(sd_event *e) {
 
         event_close_inode_data_fds(e);
 
-        if (event_next_pending(e) || e->need_process_child)
+        if (event_next_pending(e) || e->need_process_child || !LIST_IS_EMPTY(e->inotify_data_buffered))
                 goto pending;
 
         e->state = SD_EVENT_ARMED;
@@ -3954,7 +3954,7 @@ static int process_epoll(sd_event *e, usec_t timeout, int64_t threshold, int64_t
         n_event_max = MALLOC_ELEMENTSOF(e->event_queue);
 
         /* If we still have inotify data buffered, then query the other fds, but don't wait on it */
-        if (e->inotify_data_buffered)
+        if (!LIST_IS_EMPTY(e->inotify_data_buffered))
                 timeout = 0;
 
         for (;;) {
diff --git a/src/libsystemd/sd-event/test-event.c b/src/libsystemd/sd-event/test-event.c
index ea29def3d5..cc3b84cf46 100644
--- a/src/libsystemd/sd-event/test-event.c
+++ b/src/libsystemd/sd-event/test-event.c
@@ -757,4 +757,56 @@ TEST(inotify_self_destroy) {
         assert_se(sd_event_loop(e) >= 0);
 }
 
+struct inotify_process_buffered_data_context {
+        const char *path[2];
+        unsigned i;
+};
+
+static int inotify_process_buffered_data_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
+        struct inotify_process_buffered_data_context *c = ASSERT_PTR(userdata);
+        const char *description;
+
+        assert_se(sd_event_source_get_description(s, &description) >= 0);
+
+        assert_se(c->i < 2);
+        assert_se(streq(c->path[c->i], description));
+        c->i++;
+
+        return 1;
+}
+
+TEST(inotify_process_buffered_data) {
+        _cleanup_(rm_rf_physical_and_freep) char *p = NULL, *q = NULL;
+        _cleanup_(sd_event_source_unrefp) sd_event_source *a = NULL, *b = NULL;
+        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+        _cleanup_free_ char *z = NULL;
+
+        /* For issue #23826 */
+
+        assert_se(sd_event_default(&e) >= 0);
+
+        assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &p) >= 0);
+        assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &q) >= 0);
+
+        struct inotify_process_buffered_data_context context = {
+                .path = { p, q },
+        };
+
+        assert_se(sd_event_add_inotify(e, &a, p, IN_CREATE, inotify_process_buffered_data_handler, &context) >= 0);
+        assert_se(sd_event_add_inotify(e, &b, q, IN_CREATE, inotify_process_buffered_data_handler, &context) >= 0);
+
+        assert_se(z = path_join(p, "aaa"));
+        assert_se(touch(z) >= 0);
+        z = mfree(z);
+        assert_se(z = path_join(q, "bbb"));
+        assert_se(touch(z) >= 0);
+        z = mfree(z);
+
+        assert_se(sd_event_run(e, 10 * USEC_PER_SEC) > 0);
+        assert_se(sd_event_prepare(e) > 0); /* issue #23826: this was 0. */
+        assert_se(sd_event_dispatch(e) > 0);
+        assert_se(sd_event_prepare(e) == 0);
+        assert_se(sd_event_wait(e, 0) == 0);
+}
+
 DEFINE_TEST_MAIN(LOG_DEBUG);